Peyton Manning shocks everyone by running at practice

ENGLEWOOD, CO - AUGUST 03: Denver Broncos quarterback Peyton Manning (18) heads to the weight room on his day off from practice during day 4 of training camp August 3, 2015 at Dove Valley. (Photo By John Leyba/The Denver Post via Getty Images)

Peyton Manning made an absolutely jaw-dropping play during the Denver Broncos practice Saturday. Unfortunately for Manning, the gasps probably weren't for the best reasons.

The 39-year-old often is criticized for his lack of mobility, and it was much of the same when Manning decided to run the ball for a first down during one of the early drills.

Coaches, teammates and even the referee looked on in awe as the former MVP ran down the field.